JP2008159540A - Image forming device and electronic equipment provided with usb connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic equipment provided with a USB connector which prevents electronic components from destruction caused by discharging of static electricity from the outside of the device or static electricity charged on a USB plug or a human body. <P>SOLUTION: An aperture 10a is formed at a portion of a housing 10 facing a USB connector 41 mounted on a circuit board 43, and at two long sides of the aperture 10a, a pair of cover members 13 is held on hinges 14 so as to be able to open and close and is forced in a direction of closing the aperture 10a by forcing members 15. The cover members 13 are formed of an electrically conductive material and grounded via the forcing members 15. In a state where a USB plug 44 is not coupled to the USB connector 41, the cover members 13 close the aperture 10a, and the USB connector 41 or the circuit board 43 is prevented from discharging static electricity from the outside of the housing 10. At connecting of the USB plug 44 to the USB connector 41, the top end and side surfaces of the USB plug 44 contact with the cover members 13, and static electricity charged on the USB plug 44 or a human body is discharged. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device having a USB connector, and more particularly to an image forming apparatus capable of transmitting and receiving image data wirelessly.

  An electronic device such as an image forming apparatus is provided with a USB connector for transmitting and receiving data to and from other electronic devices such as a personal computer and a digital still camera. Generally, a USB connector is mounted on a circuit board, and a USB connector coupling portion coupled to a USB plug is provided so as to be exposed to the outside of the casing of the electronic device.

  On the other hand, in recent years, electronic devices that can transmit and receive data wirelessly have been put into practical use. Such electronic devices capable of wireless communication do not require a USB connector, and are required only when connected to an electronic device that does not support wireless communication. Therefore, the usage frequency of the USB connector tends to decrease.

  By the way, if the connecting portion of the USB connector to the USB plug is exposed outside the housing, the electronic components mounted on the circuit board may be destroyed by static electricity from the outside of the housing. Specifically, when the USB plug is connected to the USB connector, if the USB plug insulation coating or the human body is charged with static electricity, the static electricity is discharged to the metal part of the USB connector, and the conductor of the circuit board is further connected. A current flows through the electronic component mounted on the circuit board, and the electronic component is destroyed.

  In order to prevent the destruction of electronic components due to external static electricity, in Patent Document 1, a USB connector is provided inside the housing, and a gap is provided between the opening of the housing where the USB plug is inserted and the USB plug. Insulating members that are in close contact with the outer periphery of the USB plug are provided at the opening of the housing. However, in such a configuration, when the USB plug is not coupled, the USB connector is exposed from the opening of the housing, and it is impossible to prevent static discharge from the outside. In addition, when static electricity is charged on the USB plug insulation coating or the human body, the discharge of static electricity cannot be prevented.

  In Patent Document 2, in a connector with a cover whose outer surface is covered with a shield case and provided with a cover so as to shield the contact, the cover is opened and closed in conjunction with the coupling operation of the plug, and the contact is destroyed by static electricity. In order to prevent this, a metal shield is attached to the cover. However, providing such a shield case and a cover with a metal shield attached to a small and low-cost USB connector is unrealistic because it increases the size and cost of the USB connector.

  In Patent Document 3, in order to prevent static electricity from being discharged from the opening of the housing to the connector in the housing, an antistatic shutter that is opened and closed by gears and springs is provided at the opening of the housing. ing. However, in such a configuration, the shutter opening / closing mechanism is complicated, the number of parts is large, and the casing is enlarged. In addition, when static electricity is charged on the USB plug insulation coating or the human body, the discharge of static electricity cannot be prevented.

  In Patent Document 4, when a plug is inserted into a connector, in order to discharge static electricity charged in the plug or the human body, a contact member for discharging the static electricity by contacting the terminal of the plug at the front opening of the connector Is provided. However, with such a configuration, the configuration of the connector becomes complicated, and versatility is lost, which causes a cost increase.

JP 2006-164712 A JP 2005-25994 A JP 2001-230023 A JP-A-9-199229

  The present invention has been made in order to solve the above-described problems of the conventional example, and uses a versatile USB connector and USB plug. In addition to providing an image forming apparatus and an electronic device equipped with a USB connector that can prevent destruction of an electronic component due to discharge of static electricity charged to the USB plug or the human body when the USB plug is coupled to the USB connector. Objective.

In order to achieve the above object, the invention of claim 1
A housing,
A paper feed tray provided in the housing and on which recording paper is placed;
A paper discharge tray that is provided on the opposite side of the housing from the paper feed tray and that discharges the recording paper on which an image is formed;
Recording paper transport means for picking up the recording paper placed on the paper feed tray one by one and transporting the recording paper toward the inside of the housing; and discharging the recording paper on which the image is formed to the outside of the housing;
Image forming means for forming an image on recording paper provided in the casing and being conveyed in a predetermined direction by the recording paper conveying means;
Control means for controlling the recording paper conveying means and the image forming means;
In an image forming apparatus comprising at least a part of a circuit provided in the housing and constituting a control unit, and a circuit board on which a USB connector connected to an external electronic device via a USB plug and a cable is mounted.
A wireless communication means for transmitting and receiving data to and from an external electronic device by wireless communication;
A substantially rectangular opening into which the USB plug is inserted is formed in a portion of the housing facing the front surface of the USB connector mounted on the circuit board,
A pair of cover members for closing the opening on the two long sides of the opening is held openably by a hinge so that an axis parallel to the long side is a rotation axis, and a torsion coil having conductivity It is biased in a direction to close the opening by a biasing member constituted by a spring,
The cover member is formed of a conductive resin material, and is grounded through the biasing member,
In a state where the USB plug is not coupled to the USB connector, the cover member closes the opening, thereby preventing static electricity from the outside of the housing from being discharged to the USB connector or the circuit board,
When the USB plug is coupled to the USB connector, two of the front end and side surface of the USB plug come into contact with the cover member, and the USB plug or the human body is discharged with static electricity. It is characterized in that static electricity charged on the plug or the human body is prevented from discharging to the USB connector or the circuit board.

On the other hand, the invention of claim 2
In an electronic device comprising a housing, a circuit board provided inside the housing, and a USB connector mounted on the circuit board,
An opening into which a USB plug is inserted is formed in a portion of the housing that faces the front surface of the USB connector.
On at least one side of the opening, a cover member for closing the opening is held so as to be openable and closable by a hinge, and biased in a direction to close the opening by a biasing member having conductivity and elasticity,
The cover member is formed of a conductive material, and is grounded through the biasing member.
In a state where the USB plug is not coupled to the USB connector, the cover member closes the opening, thereby preventing static electricity from the outside of the housing from being discharged to the USB connector or the circuit board,
When the USB plug is coupled to the USB connector, the front end and a part of the side surface of the USB plug come into contact with the cover member, and the USB plug or the human body is charged with static electricity, whereby the USB plug Alternatively, static electricity charged on the human body is prevented from being discharged to the USB connector or the circuit board.

According to a third aspect of the present invention, in the electronic device according to the second aspect, the opening is substantially rectangular.
The pair of cover members are held by hinges on two long sides of the opening so that an axis parallel to the long side is a rotation axis.

  According to a fourth aspect of the present invention, in the electronic device according to the second or third aspect, the cover member is formed of a conductive resin.

  According to the first aspect of the present invention, the circuit board on which the USB connector is mounted is provided inside the housing, and the USB plug is inserted into a portion of the housing facing the front surface of the USB connector mounted on the circuit board. And a pair of cover members for closing the opening is held openably and closably by a hinge so that an axis parallel to the long side of the opening is a rotation axis, and is a conductive torsion. It is urged | biased by the direction which closes opening by the urging | biasing member comprised with the coil spring. Therefore, especially when performing data transmission / reception by wireless communication with other electronic devices such as personal computers and digital still cameras, since the USB connector is not used, in a state where the USB plug is not coupled to the USB connector, The cover member closes the opening, thereby preventing static electricity from the outside of the housing from being discharged to the USB connector or the circuit board. Further, since the cover member is formed of a conductive resin material and is grounded via the biasing member, when the USB plug is coupled to the USB connector, two of the front end and the side surface of the USB plug are the cover member. The static electricity charged on the USB plug or the human body is discharged, thereby preventing the static electricity charged on the USB plug or the human body from being discharged to the USB connector or the circuit board. And compared to the configuration of the conventional example, since the universal USB connector and USB plug that have been used conventionally can be used as they are, it is not necessary to prepare a dedicated connector, with a simple configuration, An image forming apparatus that is low in cost and can prevent the destruction of electronic components due to the discharge of static electricity charged on the USB plug or the human body when the USB plug is coupled to the USB connector as well as static electricity from the outside of the housing. Can be provided. Furthermore, since the opening is substantially rectangular and the pair of cover members are held by hinges so that the two long sides of the opening have an axis parallel to the long side as a rotation axis, the rotation radius of the cover member is short. Thus, the distance between the front surface of the USB connector mounted on the circuit board and the inner peripheral surface of the housing can be shortened. As a result, the image forming apparatus can be reduced in size.

  According to the second aspect of the present invention, the circuit board on which the USB connector is mounted is provided inside the housing, and the USB plug is inserted into a portion of the housing facing the front surface of the USB connector mounted on the circuit board. A substantially rectangular opening is formed, and a cover member for closing the opening is held by a hinge on at least one side of the opening so as to be opened and closed, and is urged in a direction to close the opening by a conductive urging member. Yes. Therefore, in a state where the USB plug is not coupled to the USB connector, the cover member closes the opening, thereby preventing static electricity from the outside of the housing from being discharged to the USB connector or the circuit board. In addition, since the cover member is made of a conductive material and is grounded via the biasing member, when the USB plug is connected to the USB connector, the front end and part of the side surface of the USB plug come into contact with the cover member. Then, the static electricity charged on the USB plug or the human body is discharged, thereby preventing the static electricity charged on the USB plug or the human body from being discharged to the USB connector or the circuit board. And compared to the configuration of the conventional example, since the universal USB connector and USB plug that have been used conventionally can be used as they are, it is not necessary to prepare a dedicated connector, with a simple configuration, In addition to low-cost, electronic devices that can prevent the destruction of electronic components due to the discharge of static electricity charged on the USB plug or the human body when the USB plug is connected to the USB connector as well as static electricity from outside the housing. can do.

  According to the invention of claim 3, since the opening is substantially rectangular and the pair of cover members are held by hinges so that the two parallel sides of the opening have an axis parallel to the long side as a rotation axis. The rotation radius of the cover member is shortened, and the distance between the front surface of the USB connector mounted on the circuit board and the inner peripheral surface of the housing can be shortened. As a result, the electronic device can be reduced in size.

  According to the invention of claim 4, since the cover member is made of a conductive resin, it is possible to make the appearance and surface finish of the housing and the cover member uniform, and make the opening and the cover member inconspicuous. it can. Furthermore, if the casing is formed of the same conductive resin as that of the cover member, wiring for grounding the cover member via the biasing member can be eliminated.

  An electronic apparatus including an image forming apparatus and a USB connector according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a configuration of a sublimation thermal transfer printer (image forming apparatus) 1 as an example of an electronic apparatus including a USB connector according to the present embodiment.

  As shown in FIG. 1, a sublimation thermal transfer printer 1 (hereinafter simply referred to as printer 1) is provided with a housing 10 and, for example, a back side of the housing 10 and a paper feed tray on which recording paper 2 is placed. 11 and a pickup roller 21 that picks up the recording paper 2 one by one from the paper feed tray 11 and pulls it into the housing 10 and a transport roller that reciprocates the recording paper 2 in the predetermined transport direction X inside the housing 10. A recording paper transport mechanism (recording paper transport means) 20 provided with 22 and 23, and a predetermined position facing the recording paper transport mechanism 20, and a direction perpendicular to the transport direction X (direction perpendicular to the paper surface: hereinafter Y A thermal head 31 in which minute heating elements are arranged in a direction), a first reel 33 on which an unused ink ribbon roll 32 is mounted, a second reel 34 on which a used portion of the ink ribbon 35 is wound, and the like. The image forming unit (image forming unit) 30 that forms an image on the recording paper 2 conveyed by the recording paper conveying mechanism 20 and the opposite side of the housing 10 from the paper feed tray 11 in the conveying direction X (for example, A paper discharge tray 12 on which the recording paper 2 that is formed by the image forming unit 30 and is discharged from the housing 10 by the recording paper transport mechanism 20 is placed, and the recording paper transport mechanism 20. And a control circuit (control means) 40 for controlling the image forming unit 30, and at least a part of the control circuit 40 such as a CPU constituting the control circuit 40, a USB connector 41, and a wireless communication circuit 42 are mounted. The circuit board 43 is used.

  The pickup roller 21 and the transport rollers 22 and 23 of the recording paper transport mechanism 20 rotate about a rotation axis 60 in the Y direction orthogonal to the transport direction X, and contact the recording paper 2 to transport the recording paper 2 in the transport direction. . The pickup roller 21 rotates only in one direction, and after the recording paper 2 is picked up from the paper supply tray 11 and drawn into the housing 10, the rotation is stopped. On the other hand, while the image forming unit 30 forms an image on the recording paper 2, the transport rollers 22 and 23 reciprocate the recording paper 2 a plurality of times in the transport direction inside the housing 10. The recording paper transport mechanism 20 further includes driven gears 51 and 52 attached to the rotation shafts 60 of the transport rollers 22 and 23, a motor 53 that generates a driving force, and a driving force of the motor 53. And a gear train 50 for transmitting a driving force.

  Note that the distance between the axes of the two transport rollers 22 and 23 in the transport direction X determines the minimum size in the transport direction X of the recording paper 2 that can be printed by the printer 1. On the other hand, the arrangement length of the minute heating elements of the thermal head 31 in the Y direction orthogonal to the transport direction X determines the maximum size in the Y direction orthogonal to the transport direction X of the recording paper 2 that can be printed by the printer 1. Generally, since the size of the recording paper is determined by a standard such as JIS, the maximum size and the minimum size of the recording paper 2 that can be printed are determined from the standard. On the other hand, as a dedicated printer for outputting an image photographed by a digital still camera, for example, a printer compatible only with the L size of a photo size has been commercialized.

  For example, three types of inks of three primary colors (Y, M, and C) and an overcoat coating agent are sequentially arranged on a ribbon having a width corresponding to the arrangement length of the micro heating elements of the thermal head 31. The ink is applied in a rectangular shape corresponding to the maximum size of the recording paper 2 that can be printed by the printer 1 (not shown because it is publicly known). Actually, the size of each rectangular area on the ink ribbon 35 is set to be slightly larger than the size of the recording paper 2 in consideration of the margin. The number of ink colors on the ink ribbon 35 is not limited to the above three colors, and may be four colors including B (black) or five or more colors including an intermediate color.

  When an image is formed on the recording paper 2 by the image forming unit 30, the leading edge of the recording paper 2 is transported to a predetermined reference position P in the transporting direction X, and the rectangular coated on the leading edge of the recording paper 2 and the ink ribbon 35 is used. Align each area of the shape. Then, while conveying both in the same direction at the same speed, the heating / non-heating of each heating element of the thermal head 31 is controlled using the image data, and the ink on the ink ribbon 35 is transferred onto the recording paper 2. For example, when a Y-color image is formed on the recording paper 2, the recording paper transport mechanism 20 is driven in the reverse direction while the ink ribbon 35 is stopped at the same position, and the leading edge of the recording paper 2 is moved to the reference position. Match. Then, the next M color image is formed on the recording paper 2 in the same procedure. When images are formed on the recording paper 2 for all colors, the entire surface of the recording paper 2 is finally overcoated, and image formation is completed.

  The thermal head 31 can move up and down in the Z direction orthogonal to both the transport direction X and the Y direction orthogonal to the transport direction X, and the image is formed on the recording paper 2 transported in a predetermined direction by the image forming unit 30. Is formed so as to be in close contact with the recording paper 2 with the ink ribbon 35 interposed therebetween. On the other hand, when the recording paper 2 is conveyed in the reverse direction to the reference position, the recording paper 2 is raised to a predetermined position so as not to hinder the movement of the recording paper 2.

  The control circuit 40 includes a CPU, a ROM, a RAM, and the like, and can be connected to other external electronic devices such as a personal computer and a digital still camera via a USB connector 41, a USB cable, and a wireless communication circuit. The recording paper transport mechanism 20 and the image forming unit 30 are controlled based on image data transmitted from a personal computer, a digital still camera, or the like, and the recording paper 2 transported in the transport direction X by the recording paper transport mechanism 30. Form an image on top.

  2 and 3 are cross-sectional views showing a configuration in the vicinity of the USB connector 41 mounted on the circuit board 43. FIG. 2 shows a USB plug 44 (cable not shown) of the USB cable attached to the USB connector 41. FIG. FIG. 3 shows a state where the USB plug 44 is engaged with the USB connector 41.

  As shown in FIGS. 2 and 3, a substantially rectangular opening 10 a into which the USB plug 44 is inserted is formed in a portion of the housing 10 facing the front surface 41 a of the USB connector 41 mounted on the circuit board 43. Yes. The USB connector 41 and the USB plug 44 on the printer side have a flatness smaller than that of the USB connector and the USB plug (not shown) on the external electronic device side such as a personal computer or a digital still camera, and have a rectangular shape close to a square. In the present embodiment, the USB connector 41 is mounted on the circuit board 43 so that the horizontal width is longer than the vertical height.

  On the two long sides of the opening 10a, a pair of cover members 13 for closing the opening 10a are held by a hinge 14 so as to be openable and closable so that an axis parallel to the long side is a rotation axis. Further, an urging member 15 composed of a conductive torsion coil spring is provided in the vicinity of the hinge 14, and the two arms of the urging member 15 are respectively connected to the inner peripheral surface of the housing 10 and the cover. It is in contact with the inner peripheral surface of the member 13. Therefore, the cover member 13 is urged by the urging member 15 in a direction to close the opening 10a. In the present embodiment, the cover member 13 is made of a conductive resin material mixed with metal fine particles, and is grounded via the biasing member 15. As a grounding method, a ground wire may be directly connected to the urging member 15, or an arm on the side of the housing 10 of the urging member 15 may be brought into contact with a terminal connected to the ground wire. Alternatively, the housing 10 may be formed of the same conductive resin material as that of the cover member 13. In that case, the ground wire can be omitted. Furthermore, by forming the cover member 13 with a conductive resin, the color tone and surface finish of the housing 10 and the cover member 13 can be made uniform, and the opening 10a and the cover member 13 can be made inconspicuous.

  The printer 1 includes a wireless communication circuit 42, and the USB connector 41 is not used when data is transmitted / received to / from other electronic devices such as a personal computer and a digital still camera by wireless communication. However, in the state where the USB plug 44 is not coupled to the USB connector 41, the USB connector 41 mounted on the circuit board 43 is provided inside the housing 10 as shown in FIG. The cover member 13 closes the opening 10a of the housing 10 facing the front surface 41a of the USB connector 41 by the urging force. Therefore, static electricity from the outside of the housing 10 can be prevented from being discharged to the USB connector 41 or the circuit board 43.

  On the other hand, when the USB plug 44 is coupled to the USB connector 41, the top and bottom surfaces of the USB plug 44 come into contact with the cover member 13 as shown in FIG. 3. As described above, since the cover member 13 is formed of a conductive resin material and is grounded via the biasing member 15, the front end and the side surface of the USB plug 44 come into contact with the cover member 13, so that the USB plug 44. Alternatively, static electricity charged on the human body is discharged. As a result, static electricity charged on the USB plug 44 or the human body is prevented from being discharged to the USB connector 41 or the circuit board 43.

  As described above, according to the configuration of the present embodiment, the versatile USB connector and the USB plug that have been conventionally used can be used as they are as compared with the configuration of the conventional example. There is no need to prepare, and the structure is simple and low-cost. In addition to static electricity from the outside of the housing, when the USB plug is connected to the USB connector, the USB plug and the electronic discharge due to static electricity charged on the human body The destruction of parts can be prevented. Furthermore, the opening 10a of the housing 10 is substantially rectangular, and a pair of cover members 13 are held by a hinge 14 so that the two long sides of the opening 10a have an axis parallel to the long side as a rotation axis. Therefore, the rotation radius of the cover member 13 is shortened, and the distance D between the front surface 41 a of the USB connector 41 mounted on the circuit board 43 and the inner peripheral surface 10 b of the housing 10 can be shortened. As a result, the printer 1 can be reduced in size.

  In the above-described embodiment, an example in which the circuit board 43 is horizontally arranged has been described. However, the present invention is not limited to this configuration, and the circuit board 43 may be arranged in the vertical direction. Further, although the torsion coil spring is used as the urging member 15, the present invention is not limited to this, and a tension coil spring or other springs may be used. Furthermore, although the conductive resin is used as the material of the cover member 13, the present invention is not limited to this, and a metal plate or the like may be used.

  In the above embodiment, a sublimation thermal transfer printer has been described as an example of an image forming apparatus. However, the present invention is not limited to this, and electrophotography such as a thermal transfer printer using thermal paper or a laser beam printer. Needless to say, the present invention can also be applied to an image forming apparatus of the type. Furthermore, the present invention is not limited to an image forming apparatus, and can be applied to all electronic devices using a USB connector.

1 is a cross-sectional view illustrating a configuration of a sublimation thermal transfer printer (image forming apparatus) as an example of an electronic device including a USB connector according to an embodiment of the present invention. It is sectional drawing which shows the structure of the vicinity of the USB connector mounted on the circuit board in the said embodiment, and shows the state which has not engaged the USB plug with the USB connector. It is sectional drawing which shows the structure of the vicinity of the USB connector mounted on the circuit board in the said embodiment, and shows the state which engaged the USB plug with the USB connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (Sublimation type thermal transfer) Printer 10 Case 10a Opening 10b (Inner case) Inner peripheral surface 11 Paper feed tray 12 Paper discharge tray 13 Cover member 14 Hinge 15 Energizing member 20 Recording paper transport mechanism (recording paper transport means)
30 Image forming unit (image forming means)
40 Control circuit (control means)
41 USB connector 42 Wireless communication circuit 43 Circuit board 44 USB plug

Claims (4)

A housing,
A paper feed tray provided in the housing and on which recording paper is placed;
A paper discharge tray that is provided on the opposite side of the housing from the paper feed tray and that discharges the recording paper on which an image is formed;
Recording paper transport means for picking up the recording paper placed on the paper feed tray one by one and transporting the recording paper toward the inside of the housing; and discharging the recording paper on which the image is formed to the outside of the housing;
Image forming means for forming an image on recording paper provided in the casing and being conveyed in a predetermined direction by the recording paper conveying means;
Control means for controlling the recording paper conveying means and the image forming means;
In an image forming apparatus comprising at least a part of a circuit provided in the housing and constituting a control unit, and a circuit board on which a USB connector connected to an external electronic device via a USB plug and a cable is mounted.
A wireless communication means for transmitting and receiving data to and from an external electronic device by wireless communication;
A substantially rectangular opening into which the USB plug is inserted is formed in a portion of the housing facing the front surface of the USB connector mounted on the circuit board,
A pair of cover members for closing the opening on the two long sides of the opening is held openably by a hinge so that an axis parallel to the long side is a rotation axis, and a torsion coil having conductivity It is biased in a direction to close the opening by a biasing member constituted by a spring,
The cover member is formed of a conductive resin material, and is grounded through the biasing member,
In a state where the USB plug is not coupled to the USB connector, the cover member closes the opening, thereby preventing static electricity from the outside of the housing from being discharged to the USB connector or the circuit board,
When the USB plug is coupled to the USB connector, two of the front and side surfaces of the USB plug are in contact with the cover member, and the USB plug or the human body is discharged with static electricity, thereby the USB plug. An image forming apparatus, wherein static electricity charged on a plug or a human body is prevented from discharging to the USB connector or the circuit board. In an electronic device comprising a housing, a circuit board provided inside the housing, and a USB connector mounted on the circuit board,
An opening into which a USB plug is inserted is formed in a portion of the housing that faces the front surface of the USB connector.
On at least one side of the opening, a cover member for closing the opening is held so as to be openable and closable by a hinge, and biased in a direction to close the opening by a biasing member having conductivity and elasticity,
The cover member is formed of a conductive material, and is grounded through the biasing member.
In a state where the USB plug is not coupled to the USB connector, the cover member closes the opening, thereby preventing static electricity from the outside of the housing from being discharged to the USB connector or the circuit board,
When the USB plug is coupled to the USB connector, the front end and a part of the side surface of the USB plug come into contact with the cover member, and the USB plug or the human body is charged with static electricity, whereby the USB plug Alternatively, an electronic device characterized in that static electricity charged on a human body is prevented from being discharged to the USB connector or the circuit board. The opening is substantially rectangular;
The electronic device according to claim 2, wherein the pair of cover members are held by hinges on two long sides of the opening so that an axis parallel to the long side is a rotation axis.   The electronic device according to claim 2, wherein the cover member is made of a conductive resin.

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